When you set the search location to sub-navigation, the conversation page looks wrong because it has no subnavigation link so the search field looks wrong:

More than likely that means you deleted the default sub-navigation links:

Ideally, those should be on there so it doesn't break the layout when there is no sub-navigation set by the page itself.
I've added some CSS to help with this scenario in the future. I still feel like you'd want to leave some of those navigation items enabled but it's adjusted in 2.2.3.

Pre-Sale Questions

If you have any questions or concerns you want to ask before you make a purchase don't hesitate to use one of our multiple support channels for your convenience.